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vead

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I need some help.I reading about TEM TE and TM Modes for Waveguides. actually I need some equations for Planar wave guide and optical fiber wave guide. I did google search. I don't understand how to write equation step by step for planar wave guide

I found this link http://examcrazy.com/Engineering/Electronics-Communication/TEM_TE_and_TM_Modes_for_Waveguides.asp

but that's for rectangular wave guide and I am looking for planar waveguide

please someone tell me link for planar wave guide ?